To create a debit note, go to Accounting ‣ Customers ‣ Invoices and follow these steps:

1. Select the desired invoice(s), click  Actions and select Create Debit Note.
2. In the Create Debit Note window, fill in the Reason and update the Use Specific Journal and Debit Note Date fields if needed.
3. Enable the Copy Lines option to copy the invoice lines and click Create Debit Note.
4. In the debit note, update the Product and Quantity and click Confirm.

 Tip - To create a debit note from the invoice form view, click the  (gear) icon and select Debit Note.

From https://www.odoo.com/documentation/17.0/applications/finance/accounting/customer_invoices/credit_notes.html#issue-a-customer-debit-note